Unit Set Up; Well Site Approval; Fuel Connections - Generac Power Systems MGG155 Operating Manual

General Information

UNIT SET UP

This unit is designed to operate with natural gas or well gas as the primary fuel and LP liquid as the secondary fuel.
For units operating on well site gas, a well test must be performed prior to installation of the unit.

Well Site Approval

A well gas chromatography analysis must be performed prior to installation of the unit. A copy of the test report must
be sent to, and preapproved by, Generac Power Systems. If the unit is moved to a new location, a new well test
must be performed. For more information, contact Generac Mobile Products Technical Support.
The unit should be installed, serviced, tested, adjusted, and otherwise prepared for use by an Independent Authorized
Service Dealer. The owner is responsible for ensuring the unit emission control system meets all applicable state
and local regulations.
Risk of Fire. Unit must be positioned in a manner that prevents combustible material
accumulation underneath. Failure to do so could result in death or serious injury.

Fuel Connections

Almost all operation problems are related to the installation techniques used. DO NOT guess, be sure pipe size is
adequate for required flow rate. See
Natural Gas Connections
Follow the steps below:
1. Before connecting the natural gas fuel line to the unit, apply pipe sealant to the NPT threads of the fitting at
the end of the fuel line.
Note: Do not apply pipe sealant to the flared (flanged) end of the fitting.
Connect the fuel line to the two inch inlet, located on the right side of the unit's frame.
2.
Be certain that all connections are sealed and no leaks are present. The installer must verify that all gas
3.
connections comply with all building codes.
Verify fuel supply pressure is adequate.
4.
Purging the Natural Gas Fuel Line
After initial setup, it may be necessary to purge the natural gas fuel line before operating the unit. LP liquid must be
available as a secondary fuel to perform this procedure.
1. Open the control door located at the back of the unit.
Remove the three screws securing the left control panel door. A Fuel Select switch is located behind the
2.
door. See Figure 8.
Move the Fuel Select switch to the LP or AUTO position.
3.
14
WARNING
(000147)
Table 1, Table 2 and Table
MGG155/210 Operating Manual
3.
35319 C